Optical lens system for image taking

An imaging lens and lens technology, applied in the field of imaging lens groups, can solve the problems of difficult control of imaging quality around the image, unfavorable Petzval sum, etc., and achieve the effect of shortening the total optical length, correcting aberrations, and maintaining miniaturization.

Active Publication Date: 2013-06-19
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent No. 7,145,736 discloses a three-piece lens group, yet the object side of the second lens in the above-mentioned three-piece lens group is a concave surface, and the image side of the second lens is a convex surface, which corrects the Petzval sum of the lens group The number (Petzval Sum) is relatively unfavorable, making it difficult to control the imaging quality around the image

Method used

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  • Optical lens system for image taking
  • Optical lens system for image taking
  • Optical lens system for image taking

Examples

Experimental program
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no. 1 example

[0096] Please refer to Figure 1A Shown is a schematic structural diagram of the first embodiment of the imaging lens group. The imaging lens group 1 is from the object side to the image side (that is, along the Figure 1A from the left side to the right side) sequentially includes an aperture 100, a first lens 110, a second lens 120, a third lens 130, an infrared infrared filter 140 and an image set on an imaging surface 150 sensing element 160 .

[0097] In this embodiment, the first lens 110 is made of plastic material and has positive refractive power. The object side 111 of the first lens is an aspherical convex surface, and the image side 112 of the first lens is an aspherical concave surface. The second lens 120 is made of plastic material and has a negative refractive power. The second lens object side 121 and the second lens image side 122 are both aspherical concave surfaces. The third lens 130 is made of plastic material and has negative refractive power. The objec...

no. 2 example

[0112] Please refer to Figure 2A As shown, it is a schematic structural diagram of the second embodiment of the imaging lens group disclosed in the present invention. Its specific implementation is substantially the same as the aforementioned first embodiment, which means that it has the same function or structure. To simplify the description, only the differences will be described below, and the rest of the similarities will not be repeated.

[0113] In this embodiment, the first lens 210 is made of plastic material and has positive refractive power, and the object side 211 and the image side 212 of the first lens are both aspherical convex surfaces. The second lens 220 is made of plastic material and has a negative refractive power. The second lens object side 221 and the second lens image side 222 are both aspherical concave surfaces. The third lens 230 is made of plastic and has negative refractive power. The object side 231 of the third lens is an aspheric convex surfac...

no. 3 example

[0126] Please refer to Figure 3A As shown, it is a schematic structural diagram of the third embodiment of the imaging lens group disclosed in the present invention. Its specific implementation is substantially the same as the aforementioned first embodiment, which means that it has the same function or structure. To simplify the description, only the differences will be described below, and the rest of the similarities will not be repeated.

[0127] In this embodiment, the first lens 310 is made of plastic material and has positive refractive power, and the object side 311 and the image side 312 of the first lens are both aspherical convex surfaces. The second lens 320 is made of plastic material and has negative refractive power. Both the object side 321 and the second image side 322 of the second lens are aspherical concave surfaces. The third lens 330 is made of plastic material and has negative refractive power. The object side 331 of the third lens is an aspherical con...

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Abstract

An optical lens system for image taking includes, in order from an object side to an image side, a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface with the at least one surface being aspheric, and a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface with the at least one surface being aspheric. The image-side surface of the third lens element includes at least one inflection point. By adjusting spacing between any two lens elements, the optical lens system for image taking has a desirable space allocation and can effectively correct the Petzval Sum in order to obtain superior imaging quality.

Description

technical field [0001] The invention relates to an imaging lens group, in particular to an imaging lens group composed of compound lenses. Background technique [0002] In recent years, with the rise of portable electronic products with photography functions, the demand for miniature imaging modules has increased day by day, and the photosensitive elements of general photography lenses are nothing more than Charge Coupled Devices (CCD) or complementary There are two types of metal oxide semiconductor elements (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and with the improvement of semiconductor process technology, the pixel size of the photosensitive element is reduced. How to improve the imaging quality of the miniaturized photographic lens under effective space conditions become the focus of industry attention. [0003] Existing miniaturized photographic lenses, in order to reduce manufacturing costs, mostly use two-piece lens structure. However, because...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18G02B1/04
CPCG02B13/0035
Inventor 蔡宗翰周明达
Owner LARGAN PRECISION
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